The strategy for prevention is pretty much the same as for any other area, moisturize, use a prevention cream if you want to be more certain of results and maintain a healthy physique.

Stretch marks on your shoulder mostly affects bodybuilders, since it does not take much mass to rip the skin, even more likely if you do not use any prevention methods.

However, women are not safe from either, so prevention is still the best method, if possible that is.

But I already have them, what to do?

Now, if you already have stretch marks on your shoulders or armpits, prevention becomes kind of pointless and removing or at least fading them comes more into play.

At this point if you decide to somehow (either commercial or homemade creams) give more nutrients to your skin, it will already have enough of a prevention effect so that new ones will not appear (unless you are still in pregnancy or are still building muscle mass).

So at this point most of your focus can be to remove them as efficiently as possible.

Rips on your shoulder usually appear either if you are overweight or as said before, gaining muscle mass.

In both cases, much more space gets occupied under your skin, giving pressure to the skin and ripping it slowly apart.

Removing Them Efficiently

While you have a good amount of ways to deal with this, generally the best course to follow is to be as less invasive as possible as both your armpit and shoulder skin is quite sensitive.

This means that severe procedures like skin or laser surgery are out of the question.

This also includes derma rolling which pierces your skin.. It would hurt a lot if done on the armpit.